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MCP9808
±0.5°C Maximum Accuracy Digital Temperature Sensor
Features
• Accuracy: - ±0.25 (typical) from -40°C to +125°C - ±0.5°C (maximum) from -20°C to 100°C - ±1°C (maximum) from -40°C to +125°C • User-Selectable Measurement Resolution: - +0.5°C, +0.25°C, +0.125°C, +0.0625°C • User-Programmable Temperature Limits: - Temperature Window Limit - Critical Temperature Limit • User-Programmable Temperature Alert Output • Operating Voltage Range: 2.7V to 5.5V • Operating Current: 200 µA (typical) • Shutdown Current: 0.1 µA (typical) • 2-wire Interface: I2C™/SMBus Compatible • Available Packages: 2x3 DFN-8, MSOP-8
Description
Microchip Technology Inc.’s MCP9808 digital temperature sensor converts temperatures between -20°C and +100°C to a digital word with ±0.25°C/±0.5°C (typical/maximum) accuracy. The MCP9808 comes with user-programmable registers that provide flexibility for temperature sensing applications. The registers allow user-selectable settings such as Shutdown or Low-Power modes and the specification of temperature Alert window limits and critical output limits. When the temperature changes beyond the specified boundary limits, the MCP9808 outputs an Alert signal. The user has the option of setting the Alert output signal polarity as an active-low or activehigh comparator output for thermostat operation, or as a temperature Alert interrupt output for microprocessorbased systems. The Alert output can also be configured as a critical temperature output only. This sensor has an industry standard 400 kHz, 2-wire, SMBus/I2C compatible serial interface, allowing up to eight or sixteen sensors to be controlled with a single serial bus (see Table 3-2 for available Address codes). These features make the MCP9808 ideal for sophisticated, multi-zone, temperature-monitoring applications.
Typical Applications
• • • • • • • • General Purpose Industrial Applications Industrial Freezers and Refrigerators Food Processing Personal Computers and Servers PC Peripherals Consumer Electronics Handheld/Portable Devices
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Package Types
8-Pin 2x3 DFN*
SDA 1 8 VDD EP 9 7 A0 6 A1 5 A2
8-Pin MSOP
SDA 1 SCL 2 Alert 3 GND 4 8 VDD 7 A0 6 A1 5 A2
Temperature Accuracy
40%
TA = -20°C, 25°C, 85°C, 100°C VDD = 3.3V 854 units
SCL 2 Alert 3 GND 4
30%
Occurrences
* Includes Exposed Thermal Pad (EP); see Table 3-1.
20%
10%
0%
-0.5
-0.4
-0.3
-0.2
-0.1
0.1
0.2
0.3
0.4
Temperature Accuracy (°C)
© 2011 Microchip Technology Inc.
0.5
0.0
DS25095A-page 1
Datasheet pdf - http://www.DataSheet4U.co.kr/
MCP9808
Functional Block Diagram
Hysteresis Shutdown Critical Trip Lock Alarm Window Lock Clear Alert Alert Status Output Control Critical Alert only Alert Polarity Alert Comp./Int. Configuration Temperature TUPPER Limit TLOWER Limit TCRITICAL Limit Manufacturer ID Device ID/Rev
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Band Gap Temperature Sensor
ΔΣ ADC
+0.5°C +0.25°C +0.125°C +0.0625°C
Resolution
Register Pointer
SMBus/Standard I2C™ Interface
A0
A1
A2
Alert
SDA
SCL
VDD
GND
DS25095A-page 2
© 2011 Microchip Technology Inc.
Datasheet pdf - http://www.DataSheet4U.co.kr/
MCP9808
1.0 ELECTRICAL CHARACTERISTICS
†Notice: Stresses above those listed under “Maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
Absolute Maximum Ratings †
VDD.................................................................................. 6.0V Voltage at All Input/Output Pins .............. GND – 0.3V to 6.0V Storage Temperature ....................................-65°C to +150°C Ambient Temperature with Power Applied ....-40°C to +125°C Junction Temperature (TJ) .......................................... +150°C ESD Protection on All Pins (HBM:MM) ................ (4 kV:400V) Latch-up Current at Each Pin (+25°C) ..................... ±200 mA
TEMPERATURE SENSOR DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground and TA = -40°C to +125°C. Parameters Temperature Sensor Accuracy -20°C < TA ≤ +100°C -40°C < TA ≤ +125°C Temperature Conversion Time 0.5°C/bit 0.25°C/bit 0.125°C/bit 0.0625°C/bit Power Supply Operating Voltage Range Operating Current Shutdown Current Power-on Reset (POR) Power Supply Rejection High-Level Current (leakage) Low-Level Voltage 8L-DFN 8L-MSOP VDD IDD ISHDN VPOR Δ°C/ΔVDD IOH VOL tRES 2.7 — — — — — — — — — 200 0.1 2.2 -0.1 — — 0.7 1.4 tCONV — — — — 30 65 130 250
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Sym
Min
Typ
Max
Unit
Conditions
TACY TACY
-0.5 -1.0
±0.25 ±0.25
+0.5 +1.0 — — — — 5.5 400 2 — — 1 0.4 — —
°C °C ms ms ms ms V µA µA V °C/V µA V s s
VDD = 3.3V VDD = 3.3V 33s/sec (typical) 15s/sec (typical) 7s/sec (typical) 4s/sec (typical)
Threshold for falling VDD VDD = 2.7V to 5.5V, TA = +25°C VOH = .